MEDLINE Marks Its 45th Year

We’ve gone from 22 users to 601 million and from thousands to billions of searches. Check out what else has changed over the last 45 years.


Notable MEDLINE Events, 1971-2016
1971 2006 (Fiscal Year 2005 Statistics) 2016 (Fiscal Year 2015 Statistics)
236 indexed journals
1,222 indexed journals by September 1972
4,928 indexed journals 5,618 indexed journals
147,000 total citations for MEDLARS since January 1, 1969
490,000 total citations by September 1972
606,000 citations indexed
13,476,222 total citations
806,326 citations indexed
20,651,383 total citations
(not counting the 2 million OLDMEDLINE-derived citations that all now have MeSH)
22 users 77 million PubMed unique visits 601 million PubMed unique visitors
70,000 searches/year by June 1972 754 million PubMed searches 2.8 billion PubMed searches
(Web and API)
Operated on an IBM 360/50 mainframe computer Ran on 20 Dell PowerEdge 1850 servers, 2 CPU 8Gb RAM, with the Linux operating system in 64-bit mode Runs on approximately 62 standard Linux servers, each with two quad core 2.6-3.6 GHz Intel Nehalem CPUs, 48-64 GB of memory, 1TB of local storage, and a Gigabit Ethernet connection
Available via dial-up telecommunications for a fee Available via the Internet World Wide Web Still available free on the Internet World Wide Web

More Information
MEDLINE Celebrates Its 45th Anniversary! (NLM Technical Bulletin)
Happy 35th Birthday, MEDLINE!
PubMed Celebrates its 20th Anniversary!